Merge branch 'master' into 'containers'

.gitignore

.gitlab-ci.yml

.gitlab/merge_request_templates/.gitkeep

.gitlab/merge_request_templates/default_mr.md

build/README.md

build/testing/.gitkeep

containers/docker/Dockerfile

src/Makefile

src/cluster/Makefile

src/cluster/cluster.cpp

src/cluster/np_cluster.cpp

src/include/Configuration.h

src/include/List.h

src/include/Parsers.h

src/include/TransitionMatrix.h

src/include/file_io.h

src/include/sph_subs.h

src/include/tra_subs.h

src/libnptm/Commons.cpp

src/libnptm/Configuration.cpp